Effects of Cold Rolling and Strain-Induced Martensite Formation in a SAF 2205 Duplex Stainless Steel

Breda, Marzia; Brunelli, Katya; Grazzi, Francesco; Scherillo, A.; Calliari, Irene

doi:10.1007/s11661-014-2646-x

Cited by 74 publications

(62 citation statements)

References 36 publications

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“…carbon, nickel and manganese, reducing stacking fault energy, heat treatments, etc. 25) . Although the determination with EDX is semi-quantitative, Azdent's higher Mn content may partially account for the higher austenite fraction, for the martensite phase transformation would be harder to take place.…”

Section: Discussionmentioning

confidence: 99%

“…Essentially XRD is sensitive to the nearsurface layer (few μm) 24) . Also, for samples with strongly oriented texture, like the archwires, quantitative phase analysis with XRD based on the random crystal model cannot be carried out reliably without relying on sophisticated corrections for preferred orientation 20,25) . Thus timing is perfect for introducing new technique.…”

Section: Introductionmentioning

confidence: 99%

“…It has been proven that ND provides reliable quantification of phase composition even in oriented samples 25) . Standard energy dispersive X-ray spectroscopy (EDX) as a chemical compositional technique shows similar surface sensitivity as XRD: the signals are from the near-surface region so it is not a bulk analysis technique 29) .…”

Section: Introductionmentioning

confidence: 99%

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Orthodontic archwire composition and phase analyses by neutron spectroscopy

Tian

Festa

Basoli

et al. 2017

Dental Materials Journal

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Quantitative metallurgical and phase analyses employing neutron diffraction technique were conducted on two as-received commercial rectangular austenitic stainless steel orthodontic archwires, G&H and Azdent, 0.43×0.64 mm (0.017×0.025 inch). Results showed a bi-phase structure containing martensitic phase (45.67% for G&H and 6.62% for Azdent) in addition to the expected metastable austenite. The former may be a strain-induced phase-transformation arising during the cold working process of wire fabrication. Further neutron resonance capture analysis determinations provided atomic and isotopic compositions, including alloying elements in each sample, complementary to the results of traditional energy dispersive X-ray spectroscopy. Together, these results assist in relating commercial alloying recipes and processing histories with mechanical performance, strength and ductility in particular.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Orthodontic archwire composition and phase analyses by neutron spectroscopy

Tian

Festa

Basoli

et al. 2017

Dental Materials Journal

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“…Substantial references have been published focusing on the mechanisms of cold work/pre-straining on the LCF behaviours of ASS, aluminium and magnesium alloy [13][14][15][16][17], among which CL Zhou et al [18,19] investigate the effects of prior tensile plastic deformation on the torsional fatigue properties of a structural steel. As for the DSS, however, the researchers are mainly concerned with the effects of pre-straining/cold-work on the basic mechanical properties, microstructural evolution during monotonic loadings [20][21][22][23][24]. Much more efforts should be made to explore how it works on the subsequent LCF behaviours and reveals the corresponding mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205

Chen

2018

MATEC Web Conf.

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Abstract. Effects of mean strain and tensile pre-strain were investigated on the torsional fatigue behaviours of duplex stainless steel SAF2205. Two equivalent strain amplitudes (0.5%,0.7 %), three strain ratios (-1, -0.5, -0.25) and 5% tensile pre-strain were chosen. Results indicated that the mean strain had no distinct influences on the torsional fatigue behaviours in terms of cyclic stress reponse and fatigue life while tensile pre-straining made a significant increase in cyclic stress response which was mainly attributed to the cross hardening derived from the loading sequence of monotonic tension preceding to cyclic torsion and led to a reduction in fatigue life. The failure mechanisms were revealed by scanning electron microscope characterized by microcracks initiation at the extrusions in ferrite and phase boundary inhibited further propagation. Additionally, the fractography of all fatigued specimens revealed a quasi-cleavage brittle mode with features of distinct tearing ridges and cleavage facets.

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“…After early stages of deformation, the rate of strain hardening decreased nearly to zero at large strains, leading to a steady-state-like deformation behavior. Further, most of the studies on the development of microstructure and texture in duplex stainless steels are confined to UNS S32205 grade, [12,13,[17][18][19][20] and limited information is available regarding the cold-rolling behavior of UNS S32760 steel. Many pertinent questions remain to be answered regarding duplex stainless steels, including the effect of second phase on the deformation response of the first phase; the role of SFE of austenite phase in the overall deformation response; and the influence of metallurgical parameters such as initial grain size, chemical composition, and texture.…”

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confidence: 99%

Microstructure and Texture Development during Cold Rolling in UNS S32205 and UNS S32760 Duplex Stainless Steels

Kumar

Khatirkar

Chalapathi

et al. 2017

Metall Mater Trans A

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In the present study, microstructure and texture evolution during cold rolling in UNS S32205 and UNS S32760 duplex stainless steel was investigated. Both steels were unidirectionally cold rolled up to 80 pct thickness reduction. Scanning electron microscopy and electron backscattered diffraction (EBSD) were used for microstructural characterization, while X-ray diffraction (XRD) was used for the measurement of bulk texture. Strain-induced martensite (SIM) was identified and quantified with the help of magnetic measurements (B-H curve and magnetization saturation). With the increase in plastic strain, the grains became morphologically elongated along the rolling direction with the reduction in average band thickness and band spacing. SIM increased with the increase in deformation and was found to be a function of strain and the SFE of austenite. The increase in SIM was much more pronounced in UNS S32205 steel as compared to UNS S32760 steel. After cold rolling, strong a-fiber (RD//h110i) texture was developed in ferrite, while brass texture was dominant in austenite for both steels. The strength of texture components and fibers was stronger in UNS S32760 steel. Another significant feature was the development of weak c-fiber (ND//h111i) in UNS S32760 steel at intermediate deformation.

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Effects of Cold Rolling and Strain-Induced Martensite Formation in a SAF 2205 Duplex Stainless Steel

Cited by 74 publications

References 36 publications

Orthodontic archwire composition and phase analyses by neutron spectroscopy

Orthodontic archwire composition and phase analyses by neutron spectroscopy

Effects of mean strain and tensile pre-strain on torsional fatigue behaviours of duplex stainless steel SAF2205

Microstructure and Texture Development during Cold Rolling in UNS S32205 and UNS S32760 Duplex Stainless Steels

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